Inductor device

ABSTRACT

An inductor device includes a first coil and a second coil. The first coil includes a first connection member and a plurality of first circles. At least two first circles of the first circles are located at a first area, and half of the first circle of the first circles is located at a second area. The second coil includes a second connection member and a plurality of second circles. At least two second circles of the second circles are located at the second area, and half of the second circle of the second circles is located at the first area. The first connection member is coupled to the at least two first circles and the half of the first circle. The second connection member is coupled to the at least two second circles and the half of the second circle.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number108134712, filed Sep. 25, 2019, which is herein incorporated byreference.

BACKGROUND Field of Invention

The present disclosure relates to an electronic device. Moreparticularly, the present disclosure relates to an inductor device.

Description of Related Art

In the prior art, the winding method of an eight-shaped inductor devicecauses a large amount of parasitic capacitance between the coils in theinductor device. As a result, the quality factor (Q) of the inductordevice is seriously affected.

For the foregoing reason, there is a need to solve the above-mentionedproblem by providing an inductor device.

SUMMARY

The foregoing presents a simplified summary of the disclosure in orderto provide a basic understanding to the reader. This summary is not anextensive overview of the disclosure and it does not identifykey/critical elements of the present disclosure or delineate the scopeof the present disclosure. Its sole purpose is to present some conceptsdisclosed herein in a simplified form as a prelude to the more detaileddescription that is presented later.

One objective of the present disclosure is to provide an inductor deviceto resolve the problem of the prior art. The means of solution aredescribed as follows.

One aspect of the present disclosure is to provide an inductor device.The inductor device comprises a first coil and a second coil. The firstcoil comprises a first connection member and a plurality of firstcircles. At least two first circles of the first circles are located ata first area, and half of the first circle of the first circles islocated at a second area. The second coil comprises a second connectionmember and a plurality of second circles. At least two second circles ofthe second circles are located at the second area, and half of thesecond circle of the second circles is located at the first area. Thefirst connection member is coupled to the at least two first circles andthe half of the first circle. The second connection member is coupled tothe at least two second circles and the half of the second circle.

Therefore, based on the technical content of the present disclosure, theinductor device according to the embodiments of the present disclosurecan effectively reduce the parasitic capacitance between the coils ofthe inductor device so as to allow the inductor device to have a betterquality factor (Q). In addition, the frequency where the self-resonantfrequency (Fsr) of the inductor device occurs is effectively improved tomove the frequency where the self-resonant frequency occurs to a higherfrequency, thus reducing the influence on the quality factor.

It is to be understood that both the foregoing general description andthe following detailed description are by examples, and are intended toprovide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention. In the drawings,

FIG. 1 depicts a schematic diagram of an inductor device according toone embodiment of the present disclosure;

FIG. 2 depicts a schematic diagram of an inductor device according toanother embodiment of the present disclosure;

FIG. 3 depicts a schematic diagram of an inductor device according tostill another embodiment of the present disclosure;

FIG. 4 depicts a schematic diagram of an inductor device according toyet another embodiment of the present disclosure;

FIG. 5 depicts a schematic diagram of an inductor device according toanother embodiment of the present disclosure; and

FIG. 6 depicts a schematic diagram of experimental data of an inductordevice according to one embodiment of the present disclosure.

According to the usual mode of operation, various features and elementsin the figures have not been drawn to scale, which are drawn to the bestway to present specific features and elements related to the disclosure.In addition, among the different figures, the same or similar elementsymbols refer to similar elements/components.

DESCRIPTION OF THE EMBODIMENTS

To make the contents of the present disclosure more thorough andcomplete, the following illustrative description is given with regard tothe implementation aspects and embodiments of the present disclosure,which is not intended to limit the scope of the present disclosure. Thefeatures of the embodiments and the steps of the method and theirsequences that constitute and implement the embodiments are described.However, other embodiments may be used to achieve the same or equivalentfunctions and step sequences.

Unless otherwise defined herein, scientific and technical terminologiesemployed in the present disclosure shall have the meanings that arecommonly understood and used by one of ordinary skill in the art. Unlessotherwise required by context, it will be understood that singular termsshall include plural forms of the same and plural terms shall includethe singular. Specifically, as used herein and in the claims, thesingular forms “a” and “an” include the plural reference unless thecontext clearly indicates otherwise.

FIG. 1 depicts a schematic diagram of an inductor device 1000 accordingto one embodiment of the present disclosure. As shown in the figure, theinductor device 1000 includes a first coil 1100 and a second coil 1200.The first coil 1100 is wound into a plurality of first circles. Inaddition, the second coil 1200 is wound into a plurality of secondcircles. The first coil 1100 includes a first connection member 1110,and the second coil 1200 includes a second connection member 1210.

As for the structure, at least two first circles of the first circlesare located at a first area (such as an upper half area in the figure).Half of the first circle of the first circles is located at a secondarea (such as a lower half area in the figure). In other words, most ofthe circles in the first circles of the first coil 1100 are located atthe first area. Additionally, at least two second circles of the secondcircles are located at the second area (such as the lower half area inthe figure). Half of the second circle of the second circles is locatedat the first area (such as the upper half area in the figure). In otherwords, most of the circles in the second circles of the second coil 1200are located at the second area. The first connection member 1110 iscoupled to the at least two first circles located at the first area andthe half of the first circle located at the second area among the firstcircles. In addition to that, the second connection member 1210 iscoupled to the at least two second circles located at the second areaand the half of the second circle located at the first area among thesecond circles. In greater detail, the first connection member 1110 iscoupled to the first circle on an innermost side among the first circlesthat are located at the first area and the first circle on an outermostside among the first circles that are located at the second area. Forexample, the first connection member 1110 is coupled to a connectionpoint 1111 of the first circle that is located at the first area and onthe innermost side among the first circles and a connection point 1113of the first circle that is located at the second area and on theoutermost side among the first circles. In addition, the secondconnection member 1210 is coupled to the second circle on an outermostside among the second circles that are located at the first area and thesecond circle on an innermost side among the second circles that arelocated at the second area. For example, the second connection member1210 is coupled to a connection point 1211 of the second circle that islocated at the first area and on the outermost side among the secondcircles and a connection point 1213 of the second circle that is locatedat the second area and on the innermost side among the second circles.In one embodiment, the above first connection member 1110 and secondconnection member 1210 can be coupled to the connection points 1111,1113, 1211, 1213 correspondingly through vias.

In one embodiment, part of the first connection member 1110 and part ofthe second connection member 1210 overlap. In another embodiment, thefirst connection member 1110 and the second connection member 1210 arelocated on different layers. However, the present disclosure is notlimited to the above embodiment. In some embodiments, the firstconnection member 1110 and the second connection member 1210 may belocated on a same layer depending on practical needs.

In another embodiment, the first coil 1100 and the second coil 1200 arelocated on a same layer. Additionally, the first connection member 1110,the first and second coils 1100, 1200, and the second connection member1210 are respectively located on a first layer, a second layer, and athird layer. In addition to that, the first layer, the second layer, andthe third layer are sequentially stacked. In other words, the firstconnection member 1110 is located on an uppermost layer, the first andsecond coils 1100, 1200 are located on a middle layer, and the secondconnection member 1210 is located on a lowermost layer. However, thepresent disclosure is not limited to the above embodiment. In someembodiments, the first connection member 1110, the second connectionmember 1210, and the first and second coils 1100, 1200 are respectivelylocated on the first layer, the second layer, and the third layer. Inother words, the first connection member 1110 is located on theuppermost layer, the second connection member 1210 is located on themiddle layer, and the first and second coils 1100, 1200 are located onthe lowermost layer depending on practical needs. In some embodiments,part of the first connection member 1110 and part of the secondconnection member 1210 overlap the first and second coils 1100, 1200.

In one embodiment, the first coil 1100 and the second coil 1200 arecollectively wound into a first turn 1410, a second turn 1420, and athird turn 1430. The first turn 1410, the second turn 1420, and thethird turn 1430 are sequentially arranged from an outside to an inside.The first coil 1100 is wound counterclockwise from a first side (such asa center-tapped terminal 1300 on an upper side) of the first area to asecond side (such as a lower side) of the first area along the firstturn 1410, and is wound to the second turn 1420 on the second side ofthe first area. The first coil 1100 is then wound from the second sideof the first area to the second side of the first area along the secondturn 1420, and is wound to the third turn 1430 on the second side of thefirst area. After that, the first coil 1100 is wound from the secondside of the first area to the second side of the first area along thethird turn 1430, and is coupled to the first turn 1410 of the first coil1100 located at the second area through the first connection member1110. In addition, the first coil 1100 is wound from a second side (suchas the connection point 1113 on an upper side) of the second area to afirst side (such as a lower side) of the second area along the firstturn 1410.

Additionally, the second coil 1200 is wound clockwise from the firstside (such as an input terminal 1500 on the lower side) of the secondarea to the second side (such as the upper side) of the second areaalong the first turn 1410, and is wound to the second turn 1420 on thesecond side of the second area. The second coil 1200 is then wound fromthe second side of the second area to the second side of the second areaalong the second turn 1420, and is wound to the third turn 1430 on thesecond side of the second area. After that, the second coil 1200 iswound from the second side of the second area to the second side of thesecond area along the third turn 1430, and is coupled to the first turn1410 of the second coil 1200 located at the first area through thesecond connection member 1210. Additionally, the second coil 1200 iswound from the second side (such as the connection point 1211 on thelower side) of the first area to the first side (such as thecenter-tapped terminal 1300 on the upper side) of the first area alongthe first turn 1410. However, the present disclosure is not limited tothe structure shown in FIG. 1, which is merely used to illustrate one ofthe implementation methods of the present disclosure by taking anexample.

FIG. 2 depicts a schematic diagram of an inductor device 1000A accordingto another embodiment of the present disclosure. As compared with theinductor device 1000 shown in FIG. 1, the inductor device 1000A of FIG.2 has a different structure at a junction of a first coil 1100A and asecond coil 1200A. A description is provided with reference to FIG. 2. Afirst connection member 1110A is coupled to a connection point 1111A ofa first circle that is located on an innermost side among first circleslocated at a first area and a connection point 1113A of a first circlethat is located on an outermost side among a first circle located at asecond area. A second connection member 1210A is coupled to a connectionpoint 1211A of a second circle that is located on an outermost sideamong a second circle located at a first area and a connection point1213A of a second circle that is located on an innermost side amongsecond circles located at a second area. In one embodiment, part of thefirst connection member 1110A and part of the second connection member1210A overlap. In another embodiment, an area 1600A where part of thefirst connection member 1110A overlaps part of the second connectionmember 1210A does not overlap the first and second coils 1100A, 1200A.In still another embodiment, the first connection member 1110A and thefirst and second coils 1100A, 1200A are located on a same layer, and thefirst connection member 1110A and the second connection member 1210A arelocated on different layers. It is noted that, in the embodiment shownin FIG. 2, elements having the reference numbers similar to those inFIG. 1 have similar structural features. To simplify matters, adescription in this regard is not provided. In addition, the presentdisclosure is not limited to the structure shown in FIG. 2, which ismerely used to illustrate one of the implementation methods of thepresent disclosure by taking an example.

FIG. 3 depicts a schematic diagram of an inductor device 1000B accordingto still another embodiment of the present disclosure. As compared withthe inductor device 1000 shown in FIG. 1, an input terminal 1500B of theinductor device 1000B of FIG. 3 further includes a first input member1510B and a second input member 1520B, and a structural arrangement ofthe inductor device 1000B is different. A description is provided withreference to FIG. 3. The first input member 1510B and the second inputmember 1520B are located at a second area (such as a lower half area inthe figure). The first input member 1510B is coupled to a second circlelocated on an innermost side among second circles. The second inputmember 1520B is coupled to a first circle that is located at the secondarea. The first input member 1510B and the second input member 1520Boverlap a second coil 1200B. In addition, a first connection member1110B is coupled to a first circle that is located at a first area andon an outermost side and a first circle that is located at the secondarea and on an innermost side. A second connection member 1210B iscoupled to a second circle that is located at the first area and on aninnermost side and a second circle that is located at the second areaand on an outermost side.

In one embodiment, a center-tapped terminal 1300B of the inductor device1000B is located at the first area (such as an upper half area in thefigure). The center-tapped terminal 1300B is coupled to a first circlelocated on an innermost side among first circles. In another embodiment,part of the first connection member 1110B overlaps part of the secondconnection member 1210B. In another embodiment, an area 1600B where partof the first connection member 1110B overlaps part of the secondconnection member 1210B does not overlap the first and second coils1100B, 1200B. In one embodiment, the first connection member 1110B andthe first and second coils 1100B, 1200B are located on different layers,the second connection member 1210B and the first and second coils 1100B,1200B are located on a same layer, and the first connection member 1110Band the second connection member 1210B are located on different layers.

In another embodiment, the first coil 1100B is wound counterclockwisefrom a first side (such as the center-tapped terminal 1300B on an upperside) of the first area to a second side (such as a lower side) of thefirst area along the third turn 1430, and is wound to the second turn1420 on the second side of the first area. The first coil 1100B is thenwound from the second side of the first area to the second side of thefirst area along the second turn 1420, and is wound to the first turn1410 on the second side of the first area. After that, the first coil1100B is wound from the second side of the first area to the second sideof the first area along the first turn 1410, and is coupled to the thirdturn 1430 of the first coil 1100B located at the second area through thefirst connection member 1110B. Additionally, the first coil 1100B iswound from a second side (such as a connection point 1113B on an upperside) of the second area to the second input member 1520B along thethird turn 1430.

In addition to that, the second coil 1200B is wound clockwise from thefirst side (such as the center-tapped terminal 1300B on the upper side)of the first area to the second side (such as the lower side) of thefirst area along the third turn 1430, and is coupled to the first turn1410 of the second coil 1200B located at the second area through thesecond connection member 1210B. In addition, the second coil 1200B iswound from the second side (such as a connection point 1213B on theupper side) of the second area to the second side of the second areaalong the first turn 1410, and is wound to the second turn 1420 on thesecond side of the second area. The second coil 1200B is then wound fromthe second side of the second area to the second side of the second areaalong the second turn 1420, and is wound to the third turn 1430 on thesecond side of the second area. After that, the second coil 1200B iswound from the second side of the second area to the first input member1510B along the third turn 1430. It is noted that, in the embodimentshown in FIG. 3, elements having the reference numbers similar to thosein FIG. 1 have similar structural features. To simplify matters, adescription in this regard is not provided. Additionally, the presentdisclosure is not limited to the structure shown in FIG. 3, which ismerely used to illustrate one of the implementation methods of thepresent disclosure by taking an example.

FIG. 4 depicts a schematic diagram of an inductor device 1000C accordingto yet another embodiment of the present disclosure. As compared withthe inductor device 10008 shown in FIG. 3, the inductor device 1000C ofFIG. 4 has a different structure at a junction of a first coil 1100C anda second coil 1200C. A description is provided with reference to FIG. 4.Part of a first connection member 1110C overlaps part of a secondconnection member 1210C. In another embodiment, an area 1600C where partof the first connection member 1110C overlaps part of the secondconnection member 1210C does not overlap the first and second coils1100C, 1200C. In one embodiment, the first connection member 1110C andthe first and second coils 1100C, 1200C are located on different layers,the second connection member 1210C and the first and second coils 1100C,1200C are located on different layers, and the first connection member1110C and the second connection member 1210C are located on differentlayers. It is noted that, in the embodiment shown in FIG. 4, elementshaving the reference numbers similar to those in FIG. 3 have similarstructural features. To simplify matters, a description in this regardis not provided. In addition, the present disclosure is not limited tothe structure shown in FIG. 4, which is merely used to illustrate one ofthe implementation methods of the present disclosure by taking anexample.

FIG. 5 depicts a schematic diagram of an inductor device 1000D accordingto another embodiment of the present disclosure. As compared with theinductor device 1000C shown in FIG. 4, circles of the inductor device1000D of FIG. 5 have more intersection structures. A description isprovided with reference to FIG. 5. First circles of the first coil 1100Dare intersected and coupled in a first area (such as an upper half areain the figure). For example, the first circles are intersected andcoupled at segments 1120D, 1130D in the first area. Second circles ofthe second coil 1200D are intersected and coupled in a second area (suchas a lower half area in the figure). For example, the second circles areintersected and coupled at segments 1220D, 1230D in the second area.However, the present disclosure is not limited to the structure shown inFIG. 5, which is merely used to illustrate one of the implementationmethods of the present disclosure by taking an example.

As shown in FIG. 1, when a voltage is inputted from the input terminal1500, a left-sided terminal of the input terminal 1500 receives apositive voltage, and a right-sided terminal of the input terminal 1500receives a negative voltage. At this time, the circles presented by adotted mesh are at a same potential (such as the positive voltage), andthe circles presented by a slashed mesh are at a same potential (such asthe negative voltage). A description is provided with reference to thehorizontal dotted line in the lower half area of the inductor device1000 shown in the figure. It can be seen from the horizontal dotted linethat most of the coils in the second area are at a same potentialbecause the same coil (such as the second coif 1200) is mostly wound inthe second area. Accordingly, the inductor device 1000 only generatesparasitic capacitance at a position where the first turn 1410 isadjacent to the second turn 1420 on a rightmost side of the horizontaldotted line. As compared with a typical eight-shaped inductor device inwhich parasitic capacitances are generated at positions where most ofthe circles are adjacent to one another, the inductor device 1000according to the present disclosure can indeed reduce the parasiticcapacitance to improve the quality factor of the inductor device 1000.It is noted that the inductor devices 1000A to 1000D of FIG. 2 to FIG. 5according to the present disclosure have a same structural configurationas that of the inductor device 1000 shown in FIG. 1. As a result, theinductor devices 1000A to 1000D can similarly reduce the parasiticcapacitance to improve the quality factor of the inductor device 1000.

FIG. 6 depicts a schematic diagram of experimental data of the inductordevices 1000 to 1000D shown in FIG. 1 to FIG. 5 according to someembodiments of the present disclosure. As shown in the figure, curve C1is the experimental data of quality factor of a typical eight-shapedinductor device. If the structural configuration of FIG. 1 according tothe present disclosure is adopted, the experimental data of qualityfactor is curve C2. As can be seen from FIG. 6, the inductor device 1000adopting the structure shown in FIG. 1 of the present disclosure has abetter quality factor. For example, at a frequency of 10 GHz, thequality factor of the curve C1 is about 11, but the quality factor ofthe curve C2 according to the present disclosure is about 13. It is thusunderstood that the quality factor of the inductor device 1000 accordingto the present disclosure is indeed better. In addition to that, curveL1 shows the inductance value of a typical eight-shaped inductor device,and its self-resonant frequency (Fsr) is about 22 GHz. Since thefrequency where the self-resonant frequency occurs is closer to the peakof the quality factor of the curve C1, it will have a greater impact onthe quality factor. In addition, as can be seen from FIG. 6, the flatrange before the point at which the curve L1 starts to rise is shorter,which in turn causes a smaller operable range. As for the inductancevalue represented by curve L2 of the inductor device 1000 having thestructure shown in FIG. 1 according to the present disclosure, itsself-resonant frequency is about 31 GHz. In comparing, since thefrequency where the self-resonant frequency occurs is farther from thepeak of the quality factor of the curve C2, its effect on the qualityfactor is smaller. Additionally, as can be seen from FIG. 6, the flatrange before the point at which the curve L2 starts to rise is longer,so that the operable range is wider.

It can be understood from the embodiments of the present disclosure thatapplication of the present disclosure has the following advantages. Theinductor device according to the embodiments of the present disclosurecan effectively reduce the parasitic capacitance between the coils ofthe inductor device so as to allow the inductor device to have a betterquality factor (Q). In addition, the frequency where the self-resonantfrequency (Fsr) of the inductor device occurs is effectively improved tomove the frequency where the self-resonant frequency occurs to a higherfrequency, thus reducing the influence on the quality factor.

Although the present invention has been described in considerable detailwith reference to certain embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims and their equivalents.

What is claimed is:
 1. An inductor device, comprising: a first coil,comprising a first connection member and a plurality of first circles,wherein at least two first circles of the first circles are located at afirst area, and half of the first circle of the first circles is locatedat a second area; and a second coil, comprising a second connectionmember and a plurality of second circles, wherein at least two secondcircles of the second circles are located at the second area, and halfof the second circle of the second circles is located at the first area,wherein the first connection member is coupled to the at least two firstcircles and the half of the first circle, wherein the second connectionmember is coupled to the at least two second circles and the half of thesecond circle.
 2. The inductor device of claim 1, wherein the firstconnection member is coupled to the first circle on an innermost sideamong the first circles that are located at the first area and the firstcircle on an outermost side among the first circles that are located atthe second area, wherein the second connection member is coupled to thesecond circle on an outermost side among the second circles that arelocated at the first area and the second circle on an innermost sideamong the second circles that are located at the second area.
 3. Theinductor device of claim 1, wherein the first connection member iscoupled to the first circle on an outermost side among the first circlesthat are located at the first area and the first circle on an innermostside among the first circles that are located at the second area,wherein the second connection member is coupled to the second circle onan innermost side among the second circles that are located at the firstarea and the second circle on an outermost side among the second circlesthat are located at the second area.
 4. The inductor device of claim 1,wherein part of the first connection member overlaps part of the secondconnection member.
 5. The inductor device of claim 1, wherein the firstconnection member and the second connection member are located ondifferent layers.
 6. The inductor device of claim 1, wherein the firstcoil and the second coil are located on a same layer.
 7. The inductordevice of claim 6, wherein the first connection member is located on afirst layer, the first coil and the second coil are located on a secondlayer, and the second connection member is located on a third layer,wherein the first layer, the second layer, and the third layer aresequentially stacked.
 8. The inductor device of claim 6, wherein thefirst connection member is located on a first layer, the secondconnection member is located on a second layer, and the first coil andthe second coil are located on a third layer, wherein the first layer,the second layer, and the third layer are sequentially stacked.
 9. Theinductor device of claim 6, wherein part of the first connection memberand part of the second connection member overlap the first coil and thesecond coil.
 10. The inductor device of claim 1, wherein the inductordevice further comprises an input terminal, wherein the input terminalis located at the second area.
 11. The inductor device of claim 10,wherein the input terminal is coupled to the first circle on anoutermost side among the first circles and the second circle on anoutermost side among the second circles.
 12. The inductor device ofclaim 11, wherein the inductor device further comprises a center-tappedterminal, wherein the center-tapped terminal is located at the firstarea.
 13. The inductor device of claim 12, wherein the center-tappedterminal is coupled to the first circle on the outermost side among thefirst circles and the second circle on the outermost side among thesecond circles.
 14. The inductor device of claim 13, wherein the firstcoil and the second coil are collectively wound into a first turn, asecond turn, and a third turn, wherein the first turn, the second turn,and the third turn are sequentially arranged from an outside to aninside, wherein the first coil is wound from a first side of the firstarea to a second side of the first area along the first turn, and iswound to the second turn on the second side of the first area, the firstcoil is then wound from the second side of the first area to the secondside of the first area along the second turn, and is wound to the thirdturn on the second side of the first area, the first coil is thereafterwound from the second side of the first area to the second side of thefirst area along the third turn, and is coupled to the first turn of thefirst coil located at the second area through the first connectionmember, wherein the first coil is wound from a second side of the secondarea to a first side of the second area along the first turn, whereinthe second coil is wound from the first side of the second area to thesecond side of the second area along the first turn, and is wound to thesecond turn on the second side of the second area, the second coil isthen wound from the second side of the second area to the second side ofthe second area along the second turn, and is wound to the third turn onthe second side of the second area, the second coil is thereafter woundfrom the second side of the second area to the second side of the secondarea along the third turn, and is coupled to the first turn of thesecond coil located at the first area through the second connectionmember, wherein the second coil is wound from the second side of thefirst area to the first side of the first area along the first turn. 15.The inductor device of claim 1, wherein the inductor device furthercomprises an input terminal, the input terminal comprises a first inputmember and a second input member, wherein the first input member and thesecond input member are located at the second area.
 16. The inductordevice of claim 15, wherein the first input member is coupled to thesecond circle on an innermost side among the second circles, and thesecond input member is coupled to the first circle located at the secondarea.
 17. The inductor device of claim 16, wherein the first inputmember overlaps the second coil, and the second input member overlapsthe first coil.
 18. The inductor device of claim 17, wherein theinductor device further comprises a center-tapped terminal, wherein thecenter-tapped terminal is coupled the first circle on an innermost sideamong the first circles.
 19. The inductor device of claim 18, whereinthe first coil and the second coil are collectively wound into a firstturn, a second turn, and a third turn, wherein the first turn, thesecond turn, and the third turn are sequentially arranged from anoutside to an inside, wherein the first coil is wound from a first sideof the first area to a second side of the first area along the thirdturn, and is wound to the second turn on the second side of the firstarea, the first coil is then wound from the second side of the firstarea to the second side of the first area along the second turn, and iswound to the first turn on the second side of the first area, the firstcoil is thereafter wound from the second side of the first area to thesecond side of the first area along the first turn, and is coupled tothe third turn of the first coil located at the second area through thefirst connection member, the first coil is wound from a second side ofthe second area to the second input member along the third turn, whereinthe second coil is wound from the first side of the first area to thesecond side of the first area along the third turn, and is coupled tothe first turn of the second coil located at the second area through thesecond connection member, the second coil is wound from the second sideof the second area to the second side of the second area along the firstturn, and is wound to the second turn on the second side of the secondarea, the second coil is then wound from the second side of the secondarea to the second side of the second area along the second turn, and iswound to the third turn on the second side of the second area, thesecond coil is thereafter wound from the second side of the second areato the first input member along the third turn.
 20. The inductor deviceof claim 18, wherein the first circles are coupled in an interlacedmanner in the first area, and the second circles are coupled in aninterlaced manner in the second area.